Default ACID must be properly defined.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-228	TSS0790	SV-228r3_rule		Medium

Description
The default ACID will be applied to any job that does not have a valid ACID associated with it. The FAIL mode ensures that access requests not conforming to the existing rule will fail. If the default ACID is allowed to successfully execute any batch job, there is a loss of accountability. Additionally, a job could modify or delete critical data and could potentially damage the system.

STIG	Date
z/OS TSS STIG	2019-12-12

Details

Check Text ( C-3548r2_chk )
a) Refer to the following reports produced by the TSS Data Collection: - TSSCMDS.RPT(#STC) - TSSCMDS.RPT(@ACIDS) Automated Analysis requires Additional Analysis. Refer to the following report produced by the TSS Data Collection: - PDI(TSS0790) b) Ensure the default STC has been set to FAIL. Otherwise, if a default ACID has been defined, review the accuracy of the ACID setup. The ACID should have no access to resources and no facility access and sourced to the internal reader. c) If (b) above is correct, there is NO FINDING. d) If (b) above is incorrect, this is a FINDING.

Check Text ( C-3548r2_chk )

a) Refer to the following reports produced by the TSS Data Collection:

- TSSCMDS.RPT(#STC)
- TSSCMDS.RPT(@ACIDS)

Automated Analysis requires Additional Analysis.
Refer to the following report produced by the TSS Data Collection:

- PDI(TSS0790)

b) Ensure the default STC has been set to FAIL. Otherwise, if a default ACID has been defined, review the accuracy of the ACID setup. The ACID should have no access to resources and no facility access and sourced to the internal reader.

c) If (b) above is correct, there is NO FINDING.

d) If (b) above is incorrect, this is a FINDING.

Fix Text (F-27393r1_fix)
The IAO will ensure the default STC ACID is defined in accordance with the following restrictions. Evaluate the impact of correcting the deficiency. Develop a plan of action and implement the changes as specified. All STCs not defined to TSS will fail upon initiation. The following command may be used to associate all undefined STCs with a default action of FAIL: TSS ADD(STC) PROCNAME(DEFAULT) ACID(FAIL) If a valid requirement exists to establish a default STC, the following restrictions also apply: a. The IAO will maintain the written request, justification, and authorization. b. The STC's ACID will have no other facilities permitted to it. c. The STC's ACID will have a permission of DSN(***) ACCESS(NONE). TSS PERMIT(stc-acid) DSN(***) ACCESS(NONE) d. The STC's ACID will not have any permission to the resources available to TSS. e. The STC's ACID will be sourced to the internal reader: ADD(stc-acid) SOURCE(INTRDR) f. An entry will be made in the STC table identifying the default ACID name as follows ("stc-acid" site defined): TSS ADD(STC) PROCNAME(DEFAULT) ACID(stc-acid)

Fix Text (F-27393r1_fix)

The IAO will ensure the default STC ACID is defined in accordance with the following restrictions. Evaluate the impact of correcting the deficiency. Develop a plan of action and implement the changes as specified.

All STCs not defined to TSS will fail upon initiation. The following command may be used to associate all undefined STCs with a default action of FAIL:

TSS ADD(STC) PROCNAME(DEFAULT) ACID(FAIL)

If a valid requirement exists to establish a default STC, the following restrictions also apply:

a. The IAO will maintain the written request, justification, and authorization.

b. The STC's ACID will have no other facilities permitted to it.

c. The STC's ACID will have a permission of DSN(*****) ACCESS(NONE).

TSS PERMIT(stc-acid) DSN(*****) ACCESS(NONE)

d. The STC's ACID will not have any permission to the resources available to TSS.

e. The STC's ACID will be sourced to the internal reader:

ADD(stc-acid) SOURCE(INTRDR)

f. An entry will be made in the STC table identifying the default ACID name as follows ("stc-acid" site defined):

TSS ADD(STC) PROCNAME(DEFAULT) ACID(stc-acid)